DNS性能测试

bind自带的queryperf可以比较方便的对DNS服务器进行性能测试，

queryperf的安装比较简单，直接在bind-9.x.x/contrib/queryperf下./configure && make就可以编译好。

README 里有比较详细的使用说明。在测试前需要准备一个域名列表。比如

xx1.dev.net A

xx2.dev.net A

xx3.dev.net A

…………..

xxn.dev.net A

然后使用queryperf -d dnsfile -s DNS_SERVER就能进行测试了。一般不开log的话QPS可以到10W，截图的是虚拟机上部署的bind，而且开了log。

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测试了一下路由器上ar7240的CPU，dns查询的性能能到接近2K。

  
Statistics:

Parse input file:     once  
Ended due to:         reaching end of file

Queries sent:         100000 queries  
Queries completed:    99993 queries  
Queries lost:         7 queries  
Queries delayed(?):   0 queries

RTT max:         	0.024000 sec  
RTT min:              0.002103 sec  
RTT average:          0.010198 sec  
RTT std deviation:    0.001260 sec  
RTT out of range:     0 queries

Percentage completed:  99.99%  
Percentage lost:        0.01%

Started at:           Wed Mar 13 16:43:14 2013  
Finished at:          Wed Mar 13 16:44:07 2013  
Ran for:              52.792922 seconds

Queries per second:   1894.060723 qps